<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Test window for top navigation by location tests</title>
<script>
  function onNav() {
    opener.postMessage(window.name, "*");
  }

  window.onload = onNav;
  window.onhashchange = onNav;
</script>
</head>
<body>
  <iframe name="if1" sandbox="allow-scripts allow-same-origin"></iframe>
  <iframe name="if2" sandbox="allow-scripts allow-same-origin allow-top-navigation"></iframe>
  <iframe name="if3" sandbox="allow-scripts allow-top-navigation"></iframe>
</body>
</html>
